ECG Toolkit

Four browser tools for ECG calipers, laddergrams, QTc and comparing tracings.

by Willy FrickAdded to the directory Nov 3, 2026

About ECG Toolkit

ECG Markup adds calibrated calipers and annotations, Ladder Studio draws laddergrams, the QTc Calculator measures the QT using a small neural network, and Compare shows an old and new tracing side by side at the same scale. Tracings are processed on your device and never uploaded.

What it does

Calibrated calipers, arrows, boxes, text and redaction
Ladder Studio laddergrams, with a pacemaker timing beta
QTc from six formulas, measured on device
Compare two tracings at the same scale
Automatic grid detection for calibration
Installable on phones

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